textareatest.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;
import java.awt.event.*;

public class TextAreaTest
    extends Frame
    implements ActionListener {
  private TextField input = new TextField();
  private TextArea output = new TextArea();
  private Button add = new Button("Add");
  private Button addLn = new Button("Add + Return");

  private class WindowCloser
      extends WindowAdapter {
    public void windowClosing(WindowEvent we) {
      System.exit(0);
    }
  }

  public TextAreaTest() {
    super("TextAreaTest");
    setup();
    add.addActionListener(this);
    addLn.addActionListener(this);
    addWindowListener(new WindowCloser());
    pack();
    show();
  }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == add) {
      output.append(input.getText());
    }
    else if (e.getSource() == addLn) {
      output.append("\n" + input.getText());
    }
  }

  private void setup() {
    Panel top = new Panel();
    top.setLayout(new BorderLayout());
    top.add("West", add);
    top.add("Center", input);
    top.add("East", addLn);
    setLayout(new BorderLayout());
    add("North", top);
    add("Center", output);
  }

  public static void main(String args[]) {
    TextAreaTest tat = new TextAreaTest();
  }
}